Pump



A; GASSENHUBER, 1R.

PUMP.. APPLlcATmMv FILED oc. 19. 1920.

PatentedJune 14, 1921.,

2 SHEETS-SHEET l.

Algra Gasssnhubar rIr.

A. GASSENHUBER, 1R.

PUMP.

` APPLlCATlDN FILED 061119,1920. 1,381,115. PateutedJune 14, 1921.

2 sHEETs-sHET 2.

A'Lurs Eass'anhubar dr. A

UNITE sra A'LOIS GASSENHUBER, JR., OF SOUTH MILWAUKEE, WISCONSIN;

PUMP.

Application filed October 19, 1920. Serial No; 417,895.'

T 0 all whom it may concern-f Be it known that I, ALors GASSENHUBER,

Jr., a citizen of the United States, and resident of South li/lilwaukec,in the county of Y Milwaukee and State of lWisconsin, have inventedcertain new and useful Improvements in Pumps; and I do hereby declarethat the following is a full, clear, and exact description thereof.

My invention refers to improvements in compound air pumps and has forits plimary object to provide a pump of this general character, thecylinders of which can be telescoped, one within the other, when thedevice is not in use so as to provide compactness, and a further objectis to simplify the valve construction, whereby the life of the valve isincreased to the maximum and the tendencyy of such valves to leak isalso overcome, due to the direct action of valves of the simple hatpacking type.

It is also an object of the invention to provide a pump which can bemanipulated with the least possible power to develop the ydesiredcompression of fluids, the compression being effected on both strokes ofthe piston.

l/Vith the above and other minor objects in view, the invention consistsin certain peculiarities of constructionand combination of mechanicalelements, as are hereinafter described and subsequently called for inthe claims.

In the drawings,

Figure 1 represents a sectional elevation of a pump embodying thefeatures of my invention, the cylinders of which are shown in theirinactive nested position, whereby the length of the pump is materiallyshortened for convenience in carrying or storing, the section beingindicated by line 1 1 of Fig. 5.

Fig. 2 is a detail sectional view of the upper head of the pump showingthe inner compression cylinder adjusted to its working position. v

Fig. 3 is a cross section ofthe pump, the section being indicated byline 3 3 of Fig. 1.

Fig. 4 isv an outside elevation of the pump upon a reduced scale,showing parts broken away and in section, and also showing thecompression cylinder distended and locked in its operative position.

Fig. 5 illustrates an elevation of the pump in its inactive position,similar to that shown the couplings or fittings maintained in in Fig. 1and it particularly illustrates the compression ypiston leading to asource of storage or a receiver.

Referring by characters to the drawings, 1 represents a base head whichvcloses the lower end of an intake cylinder 2, the upper end of the samebeing closed by head 3. rIhe upper head is centrally apertured fortelescopic union with a compression cylluder 4, which cylinder is ofcomparatively much smaller 'area than the fluid intake cyl- 2. Both endsof the compression cylinder inder are opened and the upper end thereof1s connectedV to a fluid distributing pipe 5 by suitable couplings 6,and mounted upon 6 is a gage 6 which directly 'communicates with thepipe 5 and thereby swivelly discloses theY pressure pipe 5 or a suitableportion of storage, such for example as a pneumatic tire. rlhe lower endof the compression cylinder is provided with a flange or guided collar7, which collar is spaced from the walls of the cylinder 2'to permitfluidto freely pass therebetween. When the compression cylinder iswithdrawn or distended with relation to the cylinder 2, for workingpurposes it is locked in such distended position by anysuitable means,as for eX- ample in this instance, a set screw 8 is used,

which set screw is in threaded union with Y the upper head 3 of theintake cylinder, and is adapted to impinge against the outer wall of theVcylinder 4, as best shown in Fig. 2.

To prevent rotary movement of the'cylinder and to also give the samerigidity when it is distended, I provide a pin 9 which projects upwardlyfrom the collar 7, .the same being arranged to enter a recess 9 in theupper head 3, as shown;` Iieciprocatively mounted in the compressioncylinder-fis a hollow pistonrod 10, the lower end of which has securedthereto a centrally apertured disk 11, t'o whichrdisk is fitted ahat'packing 12 of flexible mate# rial and the same is secured to the'disk by a ring 12. The hat packing extends downwardly so as to contractwhen thepiston rod is moved toward the upper head of the cylinder and toexpand snugly of the walls thereof when the feed piston is moveddownwardly. lThe upper end of the piston rod is similarly provided withaflange ring 13 carrying a hat packing gasket 14, the outer edges efwhich extend upwardly and against the hollow piston rod.

In order to reciprocate the hollow piston 10, I provide a pair of tierods 16, which rodsl are secured to the lower valve head by a threadedconnection between their ends and the flange 11. The tie rods extendlongitudinally of the cylinder 2 and are guided at their upper ends bymeans of apertures 17 which are formed in the head 3. Thus the tie rodsextend through the headr and are connected to a reciprocative handle orcross head 18 by suitable nuts, which are in threaded union with therods, it being `understood thatthe cross head 18 is aperis compressed toa predetermined degree, duel tured for reciprocative movement upon thecompression cylinder. Thus the tie rods and all reciprocative parts areguided and firmly held against side strain. In order to further guidetheparts and prevent twist of the cylinder 4l, the vcollar 7 thereof isprovided with peripheral notches which have frictional engagement withthe tie rods, as best shown in Fig. 3.

From the foregoing description, it will be seen that when the apparatusis to be put into working position, the set screw 8, as in clampingengagement with the nested compression cylinder, is also distended, dueto its open end coming into `engagement with the {iange 11 of the pistonhead mechanism. The compression cylinder will then assume thepositionshowninhFig 2, and the set screw will be employed to lock thesame in this position. A downward movement of the' piston mechanism willthus cause the air in the cylinder 2 to be forced through the hollowpiston head into the compression cylinder 10, whereby this volume of airto the different areas of the two cylinders. Upon the upstroke of thecross head 18, the packing gasket12 will contract slightly and permitatmospheric air to lpass between the end walls of the cylinder`2,whereby said cylinder is filled and while this lling action is takingplace, obviously the air or fiuid above the upper piston head associatedwith the piston 10 will beagain compressed to the l maximum volume, itbeing understood that the check valve mechanism 15 and 15 will preventuits leakage back into the pump mechanism. l

ijIt will also be observed that the simple hat packing 14 in the upperend of the hollow piston simply serves as a piston packing only, and isheld tightly against the walls of the compression cylinder by the airpressure thereabove. I-Ience, the only active parts :subject to leakagewould be the hat packing gasket 12 and the check valve mechanism 15 and15', and obviously these. two valve mechanisms being of such simpleform, practically no-appreciable wear will come upon them. i

Thus it will bel seen that a simple and practical double-acting pump ofthe compound type is produced, wherein the ground structure is such asto provide the minimum of wear and thus overcome the serious obj ectV todevices of this character, bearing in mind that the telescopic featureis one of the important elements of the invention wherein compactness isobtained and the compound feature of the pump is thus produced in asimple manner.

I claim:

l. A compound pump comprising an air intake cylinder having upper andlower heads, a compression open ended cylinder in telescopic union withthe intake cylinder, the same having one endextended through thecylinder head, means for locking the compression cylinder in itsdistended working position with relation to the intake cylinder, ahollow reciprocative `piston rod mounted in the compressiony cylinder, avalve head at its lower end engageable with the intake cylinder walls, acheck val-ve control head carried at its upper end engagealle with thecompression cylinder.V walls, longitudinally disposed tie rods carriedby the lower piston rod head, the same extending through the. upper headof the intake cylinder vand actuating means connecting the rods,

2. A. compound pump comprising an intake cylinder having a lower closedhead and 105 an upper head, an open ended compression cylinder intelescopic union with the intake cylinder, means for locking thecompression cylinder to distended position with relation to the firstcylinder, an open ended holl 110 low piston rodhaving anV upperhead inre-V ciprocative union with the compression cylinder and a lower valvehead inrecipro cative union with the intake cylinder, a check valvemounted in the hollow piston 115 for preventing backfiow of` air fromthe compression cylinder, a tie rod extending from the lower head ofthehollow piston and projecting through the upper head :of the intakecylinder and means secured to 120 the outer end ofjthe tie rod foractuating the hollow piston. Y A

' In testimonythat I'claimthe' foregoing I have hereuntov set Vmy handatSouth Milwaukee, in the county ofr Milwaukee and 125 State of Wisconsin.

Anors eassnnnunn JR. V

